Reduction of 2, 3-diphenyl-1, 4-diazaspiro [4.5] deca-1, 3-diene is investigated both voltammetrically (glassy-carbon electrode, 20° C, non-aqueous-solvents) and using dissolving-metals (sodium,− 78° C, tetrahydrofuran (THF)/NH3 (l)). Remarkably, electro- reduction furnishes two two-electron processes, whilst only a four-electron product results from Birch synthesis.
